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Microstructure and mechanical properties of friction stir welded powder metallurgy AA2024 alloy

粉末冶金AA2024合金搅拌摩擦焊的组织和力学性能

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Abstract

The extruded plate of powder metallurgy AA2024 aluminum alloy was successfully solid-state joined by friction stir welding (FSW) to demonstrate potential applications in the aerospace and automotive industries. For determining the optimal processing parameters of FSW, the microstructure, mechanical properties, and fracture behavior of FSW joints were evaluated. When the processing parameters were optimized with 2000 r/min rotation speed and 100 mm/min traverse speed, high quality welds were achieved. The ultimate tensile strength yield strength and elongation of the joint can reach 415 MPa (85% of the base metal strength), 282 MPa, and 9.5%, respectively. The hardness of the joint gradually decreased from the alloy matrix to the heat-affected zone. The lowest strength and hardness appeared near the heat-affected zone because of the over-aging caused by heat flow from repeated stirring during FSW. The average grain size of the stir zone (2.15 µm) was smaller than that of the base metal (4.43 µm) and the heat-affected zone (5.03 µm), whose grains had <110> preferred orientation.

摘要

本文通过搅拌摩擦焊(FSW)成功实现了粉末冶金AA2024铝合金挤压板材的焊接, 在航空航天、 汽车工业领域具有重要应用前景. 为了确定FSW的最佳加工参数, 对FSW接头的微观结构、 力学性能和断裂行为进行研究. 结果表明, 当搅拌速度为2000 r/min、焊接速度为100 mm/min时, 获得最优焊接接头性能, 其抗拉强度、 屈服强度和伸长率分别为415 MPa(母材强度的85%)、 282 MPa和9.5%. 焊接接头的硬度从合金基体到热影响区逐渐降低. 由于FSW过程中反复搅拌产生热量, 样品发生过时效, 导致热影响区附近的强度和硬度最低. 搅拌区的平均晶粒尺寸(2.15 µm)小于母材(4.43 µm)和热影响区(5.03 µm), 并且热影响区晶粒具有<110>择优取向.

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Authors and Affiliations

  1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Wei-hao Han  (韩未豪), Pei Li  (李沛), Cun-guang Chen  (陈存广), Shi-peng Dong  (董诗鹏), Zhi-meng Guo  (郭志猛) & Fang Yang  (杨芳)

  2. Beijing Engineering Research Center of High Purity Metal Sputtering Target, Beijing, 102200, China

    Nan Liu  (刘楠)

  3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Cun-guang Chen  (陈存广) & Yan-li Sui  (隋延力)

  4. Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China

    Cun-guang Chen  (陈存广), Zhi-meng Guo  (郭志猛), Fang Yang  (杨芳) & Yan-li Sui  (隋延力)

  5. Department of Mechanical Engineering, University of South Florida, Tampa, Florida, 33620, USA

    Alex A. Volinsky

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  1. Wei-hao Han  (韩未豪)
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Contributions

HAN Wei-hao and CHEN Cun-guang conducted the literature review and wrote the draft of the manuscript. LI Pei, LIU Nan, DONG Shi-peng, GUO Zhi-meng, YANG Fang and SUI Yan-li analyzed the measured data. CHEN Cun-guang provided the concept and edited the draft of manuscript. VOLINSKY Alex A modified the English language of the manuscript. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Cun-guang Chen  (陈存广).

Ethics declarations

HAN Wei-hao, LI Pei, LIU Nan, CHEN Cun-guang, DONG Shi-peng, GUO Zhi-meng, YANG Fang, SUI Yan-li and VOLINSKY Alex A. declare that they have no conflict of interest.

Additional information

Foundation item: Project(92066205) supported by the National Natural Science Foundation of China; Project(JCKY61420052008) supported by the National Defense Science and Technology Key Laboratory Foundation, China; Project(311021013) supported by Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), China; Project(FRF-MP-20-52) supported by the Fundamental Research Funds for the Central Universities, China; Project(075-15-2021-612) support from the Government of the Russian Federation

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Han, Wh., Li, P., Liu, N. et al. Microstructure and mechanical properties of friction stir welded powder metallurgy AA2024 alloy. J. Cent. South Univ. 29, 871–882 (2022). https://doi.org/10.1007/s11771-022-4962-4

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